Product details


Operating temperature range (C) 0 to 70, -40 to 85 open-in-new Find other Other interfaces

Package | Pins | Size

HTQFP (PFP) 80 196 mm² 14 x 14 NFBGA (ZAJ) 168 49 mm² 7 x 7 open-in-new Find other Other interfaces


  • Fully Supports Provisions of IEEE P1394b
    Revision 1.33+ at 1-Gigabit Signaling Rates
  • Fully Supports Provisions of IEEE 1394a-2000
    and 1394-1995 Standard for High Performance
    Serial Bus
  • Fully Interoperable With Firewire, i.LINK, and
    SB1394™, Implementation of IEEE Std 1394
  • Provides Three Fully Backward Compatible,
    (1394a-2000 Fully Compliant) Bilingual P1394b
    Cable Ports at up to 800 Megabits per Second
  • Provides Three 1394a-2000 Fully Compliant
    Cable Ports at 100/200/400 Mbits/s
  • Full 1394a-2000 Support Includes:
    • Connection Debounce
    • Arbitrated Short Reset
    • Multispeed Concatenation
    • Arbitration Acceleration
    • Fly-By Concatenation
    • Port Disable/Suspend/Resume
    • Extended Resume Signaling for Compatibility
      With Legacy DV Devices
  • Power-Down Features to Conserve Energy in
    Battery Powered Applications
  • Low-Power Sleep Mode
  • Fully Compliant With Open Host Controller
    Interface (HCI) Requirements
  • Cable Power Presence Monitoring
  • Cable Ports Monitor Line Conditions for Active
    Connection to Remote Node
  • Register Bits Give Software Control of Contender
    Bit, Power Class Bits, Link Active Control Bit, and
    1394a-2000 Features
  • Data Interface to Link-Layer Controller Pin
    Selectable From 1394a-2000 Mode (2/4/8 Parallel
    Bits at 49.152 MHz) or 1394b Mode
    (8 Parallel Bits at 98.304 MHz)
  • Interface to Link-Layer Controller Supports Low
    Cost TI Bus-Holder Isolation
  • Interoperable With Link-Layer Controllers Using
    3.3-V Supplies
  • Interoperable With Other 1394 Physical Layers
    (PHYs) Using 1.8-V, 3.3-V, and 5-V Supplies
  • Low Jitter, External Crystal Oscillator Provides
    Transmit and Receive Data at 100/200/400/800
    Mbits/s, and Link-Layer Controller Clock at 49.152
    MHz and 98.304 MHz
  • Separate Bias (TPBIAS) for Each Port
  • Low Cost, High Performance 80-Pin TQFP (PFP)
    Thermally Enhanced Package and 168-Pin ZAJ
    (BGA) Package
  • Software Device Reset (SWR)
  • Fail-Safe Circuitry Senses Sudden Loss of Power
    to the Device and Disables the Ports to Ensure
    That the TSB81BA3E Does Not Load the TPBIAS
    of Any Connected Device and Blocks any
    Leakage From the Port Back to Power Plane
  • The TSB81BA3E Has a 1394a-2000 Compliant
    Common-Mode Noise Filter on the Incoming Bias
    Detect Circuit to Filter Out Cross-Talk Noise
  • The TSB81BA3E Is Port Programmable to Force
    1394a Mode to Allow Use of 1394a Connectors
    (1394b Signaling Must Not Be Put Across 1394a
    Connectors or Cables)
  • Internal Voltage Regulator Option

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The TSB81BA3E provides the digital and analog transceiver functions needed to implement a three-port node in a cable-based IEEE 1394 network. Each cable port incorporates two differential line transceivers. The transceivers include circuitry to monitor the line conditions as needed for determining connection status, for initialization and arbitration, and for packet reception and transmission. The TSB81BA3E is designed to interface with a link-layer controller (LLC), such as the TSB82AA2, TSB12LV21, TSB12LV26, TSB12LV32, TSB42AA4, TSB42AB4, TSB12LV01B, or TSB12LV01C. It also may be connected cable port to cable port to an integrated 1394 Link + PHY layer such as the TSB43AB2.

The TSB81BA3E can be powered by a single 3.3-V supply when the VREG_PD terminal (terminal 73 on the PFP package and terminal B7 on the ZAJ package) is tied to GND. VREG_PD enables the internal 3.3-V to 1.95-V regulator which provides the 1.95-V to the core. The When VREG_PD is pulled high to VDD through at least a 1-kΩ resistor the TSB81BA3E internal regulator is off and the device can be powered by two separate external regulated supplies: 3.3-V for the I/Os and 1.95-V for the core. The core voltage is supplied to the PLLVDD-CORE and DVDD-CORE terminals to the requirements in the recommended operating conditions (1.95-V nominal). The PLLVDD-CORE terminals must be separated from the DVDD-CORE terminals. The PLLVDD-CORE and the DVDD-CORE terminals must be decoupled with 1 uF capacitors to stabilze the respective supply. Additional 0.10 µF and 0.01 µF high-frequency bypass capacitors may also be used. The separation between DVDD-CORE and PLLVDD-CORE may be implemented by separate power supply rails, or by a single power supply rail, where the DVDD-CORE and PLLVDD-CORE are separated by a filter network to keep noise from the PLLVDD-CORE supply.

The TSB81BA3E requires an external 98.304-MHz crystal oscillator to generate a reference clock. The external clock drives an internal phase-locked loop (PLL), which generates the required reference signal. This reference signal provides the clock signals that control transmission of the outbound encoded information. A 49.152-MHz clock signal is supplied to the associated LLC for synchronization of the two devices and is used for resynchronization of the received data when operating the PHY-link interface in compliance with the IEEE 1394a-2000 standard. A 98.304-MHz clock signal is supplied to the associated LLC for synchronization of the two devices when operating the PHY-link interface in compliance with the IEEE P1394b standard. The power down (PD) function, when enabled by asserting the PD terminal high, stops operation of the PLL.

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Technical documentation

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No results found. Please clear your search and try again. View all 3
Type Title Date
* Datasheet TSB81BA3E IEEE 1394b Three-Port Cable Transceiver/Arbiter datasheet (Rev. C) Mar. 03, 2016
Application notes Electrical Overstress Damage of TI 1394 PHY Devices (Rev. A) Jul. 11, 2008
Application notes IEEE 1394 EMI Board Design and Layout Guidelines Jul. 31, 2002

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HTQFP (PFP) 80 View options
NFBGA (ZAJ) 168 View options

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